curl --request POST \
  --url https://api.iotools.cloud/v1/tool/hours-calculator \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "startTime": "09:00",
  "endTime": "17:30",
  "overnight": ""
}
'

{
  "tool": "hours-calculator",
  "tool_version": "1.0.1",
  "outputs": {
    "duration": "8h 30m",
    "totalMinutes": "510",
    "decimalHours": "8.5"
  },
  "credits_used": 3,
  "credits_remaining": null
}